Cooler



FIG. 1 is a perspective view of a cooler according to my new design;

FIG. 2 is a front view of the cooler of FIG. 1, the rear view being identical thereto;

FIG. 3 is a top view of the cooler of FIG. 1;

FIG. 4 is a left side view of the cooler of FIG. 1, the right side view being identical thereto; and,

FIG. 5 is a bottom view of the cooler of FIG. 1.

Those features shown in broken lines form no part of the claimed design. 

The ornamental design for a cooler, as shown and described. 